What's your specialty? - test-drb@ccmp.vtda.org

8 Feb 2002

On 08-Feb-2002 Tony Duell wrote:
...
     I don't
have access to a "HP Apollo 725/50" because the PSU died
 and is beyond repair :-(  
   If it uses the same PSU as a 720, I might be able to get you one very
 cheaply.  Thanks for the offer :-)
 I don't know if the PSU is the same, the HP P/N is 0950-2701
 it's an ASTEC Model AA16510.
 HP wants 251$ for a new PSU (IMHO more than the machine is worth) :-(  
 Why do you think the original PSU is beyond repair? Unless it's 
 physically broken in half or something. Most SMPSU faults can be repaired 
 relatively easily (at least compared to logic board problems where there 
 are custom chips to worry about). OK, lets say the PSU is beyond repair for me and
everyone else I asked. 

This isn't one of those nice handfull-of-components PeeCee-PSUs. This
beast is about 40*15*15cm^3 and stuffed to the limit with components,
daughterboards and custom coils.
Even with a schematic it would be a pain to identify all the control 
circuits. And I don't even know what input and output voltages 
are supposed to be on the connectors... :-( 

I'm sure it's repairable with a lot of time and many years of experience.
But neither I nor my fellow students have that experience. 

...
  I'm assuming you're getting no output at all?
Is the fuse OK (and if not, 
 did it fail violently, shattered or blackened)? Any obviously burnt 
 componnents on the PCB? The fuse is OK, it's not that easy.
There is a charred diode, which most probably took some of the control
circuits with it. We replaced the diode and the PSU starts up but shuts
down again after a few seconds.

There is also a resistor inside, that obviously got to hot for years 
(the area around is colored from the heat).
Therefore I suppose this PSU isn't the perfect fit for the machine anyway.  

bye

-- 
Sanity is the trademark of a weak mind.
                -- Mark Harrold